Dialog Box's Edit Box Text Can't be Grabbed?

I'm trying to use a popup via the Dialog Box in order to allow a user to input text to create a new line (with the name of said text) in a Combo Box object. Unfortunately, when I use the Dialog Box object and put an Edit Box in it, and go to the Event Editor, I don't see any way to actually get the user-inputted text from the Edit Box within the Dialog Box object! What's the point of the Edit Box feature of the Dialog Box object if I can't even read or grab the text from it in any way?

I hope I'm just missing something here.

In the Dialog Box's expressions for the Edit Box option, I only see:
• Line Count
• Line
• Text Limit

I know how to grab text from a standard edit box. This is the Edit Box feature of the Dialog Box object.

That was it, thanks I was getting a bit worried it might not be possible. Thanks for the help everyone